Guard for weft detectors in loom transferrers



March 27, 1928,

K. J. UNWIN GUARD FOR WEFT DETECTORS IN LOOM TRANSFERRERS Filed Dec. 2 1926 lin wzor [Yen/219255 l1 Umwh Patented Mar. 27, 1928.

: UNITEDVSTATES.

* 1 ,663,926 PATENT OFFICE.

KENNETH J. UNWIN, or woacnsrnn, MASSACHUSETTS, ASSIGNOR T0 CROMPTON &

KNOWLES LOOM WORKS, OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSACHUSETTS.

GUARD FOR WEFT DETECTORS IN LOOM TRANSFERRERS.

Application filed December 27, 1926.

This invention relates to improvements in.

weft detectors of the type mounted on regularly moving transferrer arms and it is the principalobject of the invention to provide means for holding the detector out of contact with the supply of weft until exhaustion ap-.

proaches. v

In weft detectors of the type set forth in patent to Ryon No. 1,372,316 the transferrer arm is moved toward the surface to be detected on each detecting beat of the loom and the weft detector is moved downwardly;

important'object of my present invention to.

provide means for holding the detector out of contact with a full supply of weft andzto release the same so that it may have engage ment with the weft only as exhaustion approaches, It is a more particular object of my invention to provide a guard which will engage but not injure the Weft and be movable when an abundance of weft is present into holding engagement with respect to the detector, the guard acting when the'diameter of the weft is reduced to permit the detector to have a weft engaging movement.

With these and other objects which will appear as the description proceeds, my invention relates to the arrangements and combinations of parts hereinafter set forth, and

more particularly pointed out in theclaims.

In the accompanying drawingsfwherein' a convenient embodiment of my invention is shown,- 1

Fig. 1 is a central vertical section through that portion of a transferrer arm which lies over the surface to be detected when the lay is on the magazine-side of the loom and holding the detector away from the weft with the guard in contact with a full supply of filling, 4

Fig. 2'is a view similar to a portion of Fig.

1 but with theguard'in such position as to release detector with the latter 1 1 9011- Serial N0. 157,078.

tactwith a reduced supply of weft suflicient for several picks,

Fig. 3 is a view similar to Fig. 1 but with the detector released and in engagement with the bare bobbin and moving to indicating position, and c Fig. 4 is a vertical section on line 4& of Fig. '1 showing the guard.

Referring to the drawings, transferrer arm' 10 is provided with apair of spaced walls 11 between which extend a yarn engaging tip 12 and a bobbinbuttengaging heel 13. An indicating plunger 14-. is disposed for horizontal sliding movement in a portion of the transferrer arm and is normallyconstrained to move from the position shown inFig. 1 to that shown in Fig. 3 bya" compression spring 15. Said plunger is provided with a notch 16 and may have a pin 17 to engage a web 18 for limiting outward movementof the plunger. 1 r

The plunger is retained in non-indicating position bymeans of a latch 19 having a hook 20 to, enter-the notch 16 and having also a depending tail 21. A torsion spring 22 surrounds a pin 23 :on which the latch is pivoted and has one end'thereof in engagement with the transferrer armas at 2 k and the other end in engagement with the latch as at25. The effect of the spring is to hold the latch yieldingly in the position shown in Figpl. y

The detector carrier comprises a lever 26 pivoted to the transferrer arm as at 27 and having a hook 28 which receives one end of a tension spring 29. The other end'ofsaid spring is anchored to the transferrer arm as at 30 so that said spring tends normally to hold the lever 26 in raised position as shown in Fig. 1, said lever being positioned by having finger 31 thereof in engagement with web 18. y

It isto be understood that on each detectin'gzbeat the transferrer arm is given a downward movement and as the samereaches the bottom o'fits stroke the lever 26, having practically all its weight on oneside ofthe 'pinf27, will tend to move downwardly due to the inertia thereof. The matter thus far at ll and having a positioning finger 4L2 which e'ngagesa portion of the lever and holds the weft engaging teeth 44cvto one side of the studAl. The detector member 4U provided with'a lug fl f) having a hold I spring lfil inter'posed between a portion'of the guard anda fixed part of the transferrer. Said guard has a substantially horizontal arm oq having on the lower end thereof a pad 5'1, which, if desired, maybe of relatively soft material, such as felt or leather.

The lower face of this pad may be convex with respect to the surface ofthebobbinB so as to slide over the convolutions of weft without producing fraying or abrasion;

The upper portion of the arm 50 is" provided with a tooth'52 which enters the notch $6. Under normal conditions when the transferrer a rm is'raisd the lever 26 will be held upwardly by the spring 29 and the detector 40 will be held in the position shown in Fig; l withf'respect to thevtransferrer. The guardwillbe in the position inclicated in dotted lines in 1' so that the tooth 52 is below and to one side of the notch 46. As the transferrer arm descends toward a vfull' s up'ply of Weft the pad 51 will engage the bobbin and be moved upwardly relatively to the transferrerarm and cause tooth'52 to enter'notch 46. 'As the transfer rer arm comes to'irest atth'e'bottom of its stroke the'inerti a of the lever 26 will tend toke'ep the same moving"downwardly but the lug 4'5 overhanging the tooth 52 will prevent siich downward movement due to the fact that the pad is held by yarn on the bobbin". Under these conditionsthe parts will be in 'tliepositilo'n shown'in Fig 1. I

Asweavingcontinues a time will come when that portion ofthe bobbin immediately under the pedal will be uncover'ec'l so that astlie 'tra'nsfrrer arm moves downwardly the guard will notbe given an upward move inent around its center 48. As the trans ferrerarm reaches the bottom of movement under these conditions the lug ,{15 will be out of contact with the tooth 52 and the detector will be free to move downwardly andinto engagement withthe weft as the inertia'fof lever 26 "moves the same downwardly. *If sufficient weft is still on the bobbin" for the weavingof several picks the detectorwill be restrained against sliding movement toward the tail 21 and the plunger 14 'wi'll' re'main locked eventliough the detector isuialocked. I M f lit aj siibsequent time the amountof Weft melanin-gar the bobbin'will be insuflicient for continued weaving at which time the the ,f latter re; the position sl the lowered position of the guard 47, will move along the denuded bobbin and into contact with, the tail 21 of the latch to move iown in Fig. 3,

thus releasing plungerl. 0 permit spring 15 to move the same to'tliindicating posi- 9 sh wn. in a d, ward movement of the transferrer arm an indicatinglever, not shown herein but set forth in the aforesaid patent to Ryon, will beengagedby the plunger to initiate replenishment. V v

As soon as a .full bobbin, has ferred into the shuttlethe guardt'r' will againlbe moved upwardly relatively to thetransferrer arml into detector restraining or locking position to hold the teeth of said detector away fronrtlije weft, and this rela 7 tion w ll continuejuiitlll'the.new bobbin assuinesa condition siinilartothat indicated inF1gr2.

been trans-.

Upon the uplFromthe'iforegoing it willlbef seen that have provided ,a weft 7 deteeting ineehanis n for a regularly movingtransferrer wherein theteeth'ofrthe detector are; held away from the Lweftf funtil the latter has 1 been depleted sufficiently to, render detection. onjeach detect-j ing beat of the .loom. desirable. It will further be seen u thattlie pad 51,' although in cont'act.with the bobbin ,on' all detecting beats of the ,loom,is' formed with a smooth lower surfaee suchas will not ,abrade the weft. Although I have shown this pad as lleather'or fibre yet 11 do not wishto be limited to theseinatjerials asany substance presenting-asmooth, orjsoft SLlIfQCB liOjhQ weft will suflice. It will further be seen that the guard located in such a positionthat V the detector will be'jreleased in time .to permit the same to haveengagement with the weft during the latter part of the time that the bobbi'n'is active and when the remaining amount of yarnissuchI that a new surface is exposed each successive detecting beat of the loom. 1 v f 'Ha'ving thusv described ,my invention it will be apparent thatchangesand modifications may be .made therein by those skilled in the art without departing from the spirit and scope ofthc invention-and 1 do not wish to be limited to the details herein disclosed, but what 1 claim is: o a

1. In Weft detecting mechanism for a loom having a transferrer ,arm receiving a movement toward the surface to be detected each detecting beat-jot the loom, a weft detector, acarrie'r, therefor movably mounted on vthe ,t ransfeirrer arm,- and a guardpivoted to the transferrer arm and movableby an abundant supply of weft into holdingen- V gagment :with respect; to the detector to hold .the' latter. out of contact with the weft.

,2. In-weftdeliectin g mechanism "for loom havinga transferrer arm receivlng regular movements at periodic intervals toward the supply of weft to be detected, a weft detector mounted on the transferrer arm and movable with respect thereto toward the surface to be detected in a fixed path, a guard mounted on the transferrer arm and normally positioned to be engaged by the surface to be detected and being movable under influence of the surface being detected in a fixed path which intersects the path of the detector, said guard being moved by an abundant supply of weft so that the same intersects the path of the detector to hold the latter out of engaging position with the surface to be detected and said guard being moved by a depleted supply of weft a dis tance insufficient to intersect the path of movement of the detector, whereby the latter may have detecting engagement with the surface to be detected.

3. In weft detectingmechanism for a loom having a transferrer arm receivingregular movements at periodic intervals toward the supply of weft to be detected, a weft detector mounted on and movable with respect to the transferrer arm and moving in a fixed arc toward the surface to be detected; a guard pivoted to the detector and normally positioned for engagement with the surface to be detected and movable under influence of the surface in an arc of the path which intersects the path of movement of the detector, said guard being moved by a sufficient supply of weft to intersect the path of the detector to prevent engagement. of the latter with the surface to be detected and said guard when engaged-by an insuflicient supply of weft failing to intersect the path of the detector, whereby the latter may have engagement with the surface to be detected.

In testimony whereof I have hereunto I aflixed my signature.

KENNETH J. UNWIN. 

